Listen to Robert Emmerich introduce The Big Apple, a hit song from 1937. Music written by Bob and performed by Tommy Dorsey's Clambake Seven with Bob on piano. Lyrics written by Buddy Bernier and sung by Edythe Wright. Audio provided by Dorothy Emmerich.

Performing professionals in a big city like New York often also gave performances at “tank towns.” A “tank town” (or “water tank town") was a town that had, as its main feature, the water tank that served steam locomotives in the 1800s and early 1900s. In many cases, the water tank was built before the town.

“Tank town” was a way of saying “small town” or “hick town.” “Water-tank town” was printed in an 1884 newspaper. The Sunday Herald (Chicago, IL) explained on October 11, 1891:

“I HAVE just returned from a tour of the ‘tank’ towns. A ‘tank’ town is a railroad way station originally established for watering purposes only and forming the nucleus for a composite grocery, bar-room and post-office, a church, a drug store and a town hall.”

The “tank town” term, like the steam locomotives, became mostly historical by the early 1900s.

(Oxford English Dictionary)
tank town n. U.S. a small, unimportant town, orig. one at which trains stopped to take on water.
1906 J. F. Kelly Man with Grip 11 Tank towns are big ones, compared to our route.
1940 R. Chandler Farewell, my Lovely v. 38 You would find them in tanktown vaudeville acts.

1 April 1889, Los Angeles (CA) Daily Herald, “The Southern Circuit,” pg. 3, col. 1:
All sorts of stories are current about the water-tank town manager, one being to the effect that he is one his way to Europe in connection with an affair of the heart.

11 October 1891, The Sunday Herald (Chicago, IL), “Out with a Snap Show,” pg. 25, col. 1:
I HAVE just returned from a tour of the “tank” towns. A “tank” town is a railroad way station originally established for watering purposes only and forming the nucleus for a composite grocery, bar-room and post-office, a church, a drug store and a town hall.

I was one of several tourists with a dramatic “snap.” In the theatrical vocabulary a “snap” is a dramatic organization that goes out on its “uppers” and comes back on its trunks. “Snaps” play “tank” towns. This “snap” was no exception to the rule.

12 May 1894, The Daily Picayune (New Orleans, LA), “Our Picayune,” pg. 4, col. 1:
But when they come home the neighbors will see the name of a little near-by water-tank town written in chalk on the steamer trunk.

Chronicling America
14 December 1902, New-York (NY) Daily Tribune, “Theatrical Incidents and News Notes,” pg. 3, col. 2:
The train finally pulled up at a tank town and O’Neill, calling his troop about him like a matron of an orphan asylum, led them up the platform to the station.

Google BooksConversations of a Chorus Girl
By Roy Larcom McCardell
New York, NY: Street & Smith
1903
Pg. 26:
“Finally we struck one of them water-tank towns that don’t seem to belong to the United States. You know them burgs! You are looking out of the car window at night and see two lights, and the engine goes ‘Wheep, whe-e-e-eep!’ but doesn’t stop. Well, it’s one of them.”

Google BooksVaudeville Old & New:
An Encyclopedia of Variety Performances in America
By Frank Cullen, Florence Hackman and Donald McNeilly
Psychology Press
2007
Pg. 1090:
TANK TOWNS
Derisive term for hick towns that were so small that the biggest and most important feature in town was the water tank that fed railroad locomotives. Indeed, the water tanks were often built before the towns. Locomotives needed a regular supply of water to create the steam that propelled the train, so tanks were stationed at regular intervals along the tracks to replenish the boilers’ water supply.